Machine fob



- JESSE M. GILS'IRAP, OF WASHINGTON COUNTY, ARKANSAS.

MACHINE FOR WHETTING PLANE-BITS.

Specification of Letters Patent No. 17,965, dated August 11, 185'?.

To all whom t may concern:

Be it known that I', Jnssn M. GrLs'rRAP,

of the county of lVashington and State of Arkansas, have invented a new and useful Machine for VVhetting Planing-Bits; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, and-to the letters of reference marked thereon, in which- Figure 1 is a ground view; Fig. 2, a longitudinal or side elevation.

D, is the bed plate; B, the band wheel; C, the hand crank; E, the band; F, the crankpulley; Gr, the crank shaft; R, the crank; J, the pitman; H, H, the bit holder; M, the oil stone; L, L, the guides; N, N, the slide rods; T, the plane bit; W, the wedge; K, the friction roller; A, the main shaft; X, X, the metallic posts; I the spring lever; Q, the fulcrum post; 6, the cap piece; V, the adjusting screw; 10, the stud; Z, the counterbalance; Y, the tightener; P, the tightening pulley; S, S, S1, S1, the post and O, is the gage.

The nature of my invention consists in producing and operating a bit holder H, H,

in such a manner and giving it such form that when the plane bit, T, is placed and secured therein by means of'the wedge, W, and operated on the oil stone, M, by means of the crank, R, and pitman, J, that said plane bit, T, shall be given a true and proper bevel in whetting and brought to a fine and proper edge.

To enable others skilled in machinery to make and use my invention, I will proceed to describe its construction and operation.

I make of wood a bed plate, D, and frame therein posts, S, S, S1, S1, a stud 10 and fulcrum post, Q. I cast a band wheel, B, on main shaft, A, and near the end of said shaft, A, apply a hand crank, C. However the main shaft, A, may be made of wrought ironand the band wheel, B, of solid wood. The journals of said shaft in both cases are turned and have their bearings in posts S1 S1. I cast a crank shaft, Gr, having thereon a crank pulley, F, and at one end a crank, R, and on the other end I attach a counterbalance Z, or small fly wheel. The crank shaft, G, and crank R can also be easily made of wrought iron and the crank pulley, F, of solid wood in both cases. The journals of said shaft are turned and have their bearings in posts, S, S. The band, E, is passed around the band whel, B, crank pnl-- ley F, and over the tightening pulley, P. The tightener, Y, is hinged at one end to the bed plate, D., while the other end in which the tightening pulley, P, is situated is raised or lowered in a perpendicular manner be-- tween two small posts, 5, said tightener being forced upward by a nslide block, 4, for the purpose of regulating the tension of the band, E. I make a pitman, J, giving it two small crooks as seen in Fig. l of the drawings for the purpose of giving room to place the fulcrum post, Q, in itsy proper place, it being necessary to place said fulcrum post on a line with the center of the bit holder H, H; otherwise the spring lever J would have to be crooked or given a greater elevation in the machine. Said pitman J is attached to the bit holder, I-I, H, by means of a metallic pin passed through holes in the proj ect-ions 7 8, of 'the said bit holder. (See Fig. 1 of the drawings.) The bit holder, H, H, is in general cast, though it can be made of wrought iron. The portion of it occupied by the plane bit, T, is given a proper angle so that when the plane bit, T, is placed therein or on and made fast by the wedge, W, and operated on the oil stone, M, that said operation will give the plane bit, T, a proper bevel, (see Fig. 2 of the drawings,) the oil stone, M, being horizontal and firmly embedded in the bed plate, D, the angle above mentioned being made of suiicient width to receive the widest planing bits, intended to be placed therein, there being room for the operator to tap and move the top end of the plane bit either way, thereby enabling him to whet the bit rounding at the corners when desiring to do so. On the outside of said angle stand the posts that bear the friction roller, K, the aXle of said friction roller being passed through holes near the top of said posts. Said posts are cast with and form a part of the bit holder H, H, a crooked brace uniting them with the above mentioned angle so that they form a `proper place for the wed ge, W, the portion of said bit holder, H, H, unoccupied by the plane bit, T, being horizontal and having on each side slide jaws fr, 1", in which are recesses filled with antifriction metal which move on the slide rods, N, N, said slide rods, N, N, being placed horizontal and firmly secured in and near the top of the metallic posts, X, X, either in the process of casting or by set screws. Said slide rods are made of rolled iron and polished to prevent friction. The guides, L, L, are made of about inch square bars bent in the form' in or out.A The spring lever J is in general made of wood and one end of it is made fast in and near the top of stud 10, the center of it being passed through cap piece, 6, on fulcrum post, Q, said cap piece fitting said lever on the sides but permitting it to be moved up or down in said cap piece by means of the adjusting screw, V, said spring lever J being of sufficient length as shown in Fig. 2 of the drawings to press uniformly on the fric tion roller, H, when in operation, thereby giving any degree of pressure on the plane bit, T, while operated on the oil stone, M, that the operator may desire. The crank, R, is half the length of the oil stone, M, therefore the plane bit, T, traverses the whole length of the oil stone, M, thereby having a tendency to keep it level, but in order to place the plane bit in all times the same way in relation to the ends of the oil stone, M, I use a gage O. It raises the bit holder H, H, olf of the oil stone, M, to uniform height. The plane bit is then placed in and made fast. The gage, O, is then withdrawn and remains so during the operation of whetting.

The above described machine may be operated by hand power applied to hand crank, C, or it may be operated by any other power by placing a pulley in room of hand crank It may also be operated by passing a band connected to any other machinery in motion around the crank pulley F, and thereby dispense with the band wheel B, and band E.

What I claim, and desire tosecure by Letters Patent, is-

The use of the bit holder, H, constructed as described, when operated by the devices arranged in the manner and for the purpose herin specified.

JESSE M. GILSTRAP.

Attest:

l?. R. SMITH, WHITsoN B. TAYLOR. 

